my personal opinion is that boraras brigittae will tend to disappear in a 3ft tank as they're so small. corydoras will be fine in a sand base. the only concern is that they may uproot your plants, so only introduce them after your plants have rooted firmly.
it seems that you would like schoolers in your tank...consider perhaps tetras such as cardinal or rummy nose tetras? or my personal favourite is a school of Trig, espei. the deep copper colouration with the black "triangle" provides a very good contrast to the lush green foilage in your densely planted tank imo. they're also not shy fish, so you'll see them out more often than hiding in the plant mass.
if you want feature fish, consider a pair of Apistos or Rams to be the "royalty" of your tank...king and queen, with the schoolers as their "subjects"![]()
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